The protein in tuna contains all essential amino acids required by the body for growth and maintenance of lean muscle tissue. The protein in tuna and all other fish protein are considered to be a complete protein sources.

The protein source can be important to lose weight because high quality proteins such as the protein in tuna can be used to maintain an active metabolism. Low quality protein contains low amounts of the essential amino acids required for use in protein synthesis and means the protein must either be used for energy or converted to fat.

If someone follows a calorie restricted diet there is less chance the protein will be converted to fat but more protein used for energy means less fat is used from fat stores resulting in slow weight loss progress!

The protein in tuna ensures most of it is used for maintenance of lean muscles to help keep metabolism sufficiently high to burn calories and lose weight.

Tuna protein table: 

Tuna fish (100grams)	Protein	Fat	Calories
Fresh Tuna fish (with skin)	27g	4g	130
Tuna canned in oil	26.5g	8.8g	195
Tuna canned in brine	23g	1g	100
Other canned fish protein (100grams)
Anchovies in oil	25g	18g	270
Pilchards in tomato sauce	19g	5g	120
Salmon	19.5g	8g	145
Sardine in oil	24g	13g	210

   Values for Tuna protein may vary between different brands & portions, use as guide only!

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